S., Houssou Christophe, Pierre PAGNEY Laboratory: Climate, Water, Ecosystems and Development (LaCEEDE), Faculty of Letters, Arts and Humanities (FLASH), University of Abomey- Calavi 01 BP 526, Cotonou Department of Geography and regional development, Faculty of Letters, Arts and Humanities (FLASH), University of Abomey-calavi, BP 2899 Abomey-Calavi, Benin